chore: Update TikTok API endpoint in tiktok_login function

app.py

@@ -595,7 +595,7 @@ REDIRECT_URI = 'https://lakpriya-videogen-api.hf.space/tiktok_callback'
 async def tiktok_login():
     csrf_state = uuid.uuid4().hex
     response = RedirectResponse(
-        url=f"https://www.tiktok.com/v2/auth/authorize/?client_key={CLIENT_KEY}&response_type=code&scope=user.info.basic,video.publish&redirect_uri={REDIRECT_URI}&state={csrf_state}"
+        url=f"https://www.tiktok.com/v2/auth/authorize/?client_key={CLIENT_KEY}&response_type=code&scope=user.info.basic,video.publish,video.upload&redirect_uri={REDIRECT_URI}&state={csrf_state}"
     )
     response.set_cookie(key="csrf_state", value=csrf_state, max_age=600)
     return response